package simple.runtime;

import java.security.MessageDigest;

import simple.runtime.annotations.SimpleFunction;
import simple.runtime.annotations.SimpleObject;

/**
 * 加密相关函数。
 * 
 * @author 东子 xhwsd@qq.com
 */
@SimpleObject
public final class 加密 {

  @SimpleFunction
  public static String 取MD5值(byte[] bytes) {
    char[] hexDigits = { 
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 
        'A', 'B', 'C', 'D', 'E', 'F' };
    try {
      MessageDigest mdInst = MessageDigest.getInstance("MD5");
      mdInst.update(bytes);
      byte[] md = mdInst.digest();
      int j = md.length;
      char[] str = new char[j * 2];
      int k = 0;
      for (int i = 0; i < j; i++) {
        byte byte0 = md[i];
        str[k++] = hexDigits[byte0 >>> 4 & 0xF];
        str[k++] = hexDigits[byte0 & 0xF];
      } 
      return new String(str);
    } catch (Exception e) {
      e.printStackTrace();
      return "";
    } 
  }
}